/**
 * Copyright (c) 2010 by Kevin Bierhoff.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    1. Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *    3. Neither the names of the authors nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.googlecode.syper.javasyp.formulae;

/**
 * Standard visitor baseclass for {@link Formula#dispatch(FormulaVisitor)}.
 * Written as a class that by default does nothing for now for convenience.
 * @author kevin
 * @since Jun 4, 2011
 * @param <T> Return type for {@link Formula#dispatch(FormulaVisitor)}
 */
public class FormulaVisitor<T> {

	public T visit(Local f) { return defaultVisit(f); }

	public T visit(Field f) { return defaultVisit(f); }

	public T visit(Infix f) { return defaultVisit(f); }

	public T visit(Literal f) { return defaultVisit(f); }

	public T visit(Prefix f) { return defaultVisit(f); }

	public T visit(Select f) { return defaultVisit(f); }

	public T visit(Store f) { return defaultVisit(f); }

	/** Only applicable in post-conditions */
	public T visit(Pre f) { return defaultVisit(f); }

	public T visit(Quantifier f) { return defaultVisit(f); }

	public T visit(Fun f) { return defaultVisit(f); }

	public T visit(IfThenElse f) { return defaultVisit(f); }

	protected T defaultVisit(Formula f) { return null; }
}
